TRT and Cholesterol

I have been on testosterone TRT for 5 months. I was diagnosed with hypogonadism. I also have hypothyroidism and I take .100 of Synthroid every day. I inject .4 ml of testosterone cypionate every 4 days. Before I started TRT my testosterone it was around 200. I felt tired, no libido, bad erections. The symptoms have improved slightly but I am worried about estrogen, triglycerides and HDL numbers. I am 40 years old, and I am 6’0 ,and weigh 190. I lift weights three times a week and I run 30+ miles per week. I eat well and I am very active. My doctor agreed my estrogen is too high, but he is worried that taking an estrogen blocker will further lower my HDL, so he recommended that I take 2000mg of niacin a day to see if my HDL goes up and triglycerides come down to within range. Then he will give me something to lower estrogen. Since on TRT I feel like I have gained weight in mid-section, libido and erections are only a little better. I have also gained about 20 pounds. And I have noticed I have less endurance running, I used to run 7 minutes per mile in a half marathon, now I am lucky to run under 9 minutes per mile. All of my training has been the same. Will taking an estrogen blocker fix my symptoms? Will niacin help with cholesterol numbers? Any advice is greatly appreciated.

I have been on testosterone TRT for 5 months. I was diagnosed with hypogonadism. I also have hypothyroidism and I take .100 of Synthroid every day. I inject .4 ml of testosterone cypionate every 4 days. Before I started TRT my testosterone it was around 200. I felt tired, no libido, bad erections. The symptoms have improved slightly but I am worried about estrogen, triglycerides and HDL numbers. I am 40 years old, and I am 6’0 ,and weigh 190. I lift weights three times a week and I run 30+ miles per week. I eat well and I am very active. My doctor agreed my estrogen is too high, but he is worried that taking an estrogen blocker will further lower my HDL, so he recommended that I take 2000mg of niacin a day to see if my HDL goes up and triglycerides come down to within range. Then he will give me something to lower estrogen. Since on TRT I feel like I have gained weight in mid-section, libido and erections are only a little better. I have also gained about 20 pounds. And I have noticed I have less endurance running, I used to run 7 minutes per mile in a half marathon, now I am lucky to run under 9 minutes per mile. All of my training has been the same. Will taking an estrogen blocker fix my symptoms? Will niacin help with cholesterol numbers? Any advice is greatly appreciated.

I would get proper e2 reading 4021 from quest. (to confirm if AI is needed)
If the Dr is monitor total estrogen then I would question their knowledge and understanding of proper TRT administration.
You may also want to have your thyroid parameters checked since TRT can lower thyroid as well as adrenal function (which was probably not properly evaluated from the start.)

Niacin may end up help lipids in the process of causing liver issues. Blood serums of liver function are not true indicator of how the liver is functioning.

I am not a medical Dr, please keep in mind that this answer is for information purposes only, and is not intended to diagnose, treat or replace sound medical advice from your physician or health care provider.